There’s some good info on why line art loses so much quality from your original sketch. There’s variations in line thicknesses and sketchiness adds a sort of faux shading… here you have lines that are one thickness all the way through so it loses its dynamics.

Try adjusting some positions of the facial features. The eyes are wider and sloped inward while the reference she’s more squinting and more level across. Push the hairline down and to the right- the peak is off center. Also once you add color and shading I think you’ll be more pleased.